Geodesic
The optimality of singular controls in Goursat–Darboux systems
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 15 (1975) no. 5, pp. 1157-1167 
L. T. Ashchepkov; O. V. Vasiliev. The optimality of singular controls in Goursat–Darboux systems. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 15 (1975) no. 5, pp. 1157-1167. http://geodesic.mathdoc.fr/item/ZVMMF_1975_15_5_a6/
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     author = {L. T. Ashchepkov and O. V. Vasiliev},
     title = {The optimality of singular controls in {Goursat{\textendash}Darboux} systems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1157--1167},
     year = {1975},
     volume = {15},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1975_15_5_a6/}
}
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